Impact driver



FIG. 1 is a perspective view of an impact driver showing my new design;

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

In the above drawings, the broken lines and the areas within the broken lines form no part of the claimed design. 

CLAIM The ornamental design for an impact driver, as shown and described. 